1 | /* profile.h |
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2 | |
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3 | Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. |
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4 | |
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5 | Permission to use, copy, modify, and distribute this software |
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6 | is freely granted, provided that this notice is preserved. */ |
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7 | |
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8 | #ifndef __XSCALE_PROFILE_H__ |
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9 | #define __XSCALE_PROFILE_H__ |
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10 | |
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11 | /* FIXME: |
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12 | We need to create a string version of the CPP predefined |
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13 | __USER_LABEL_PREFIX__ macro. Ideally we would like to |
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14 | so do something like: |
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15 | |
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16 | #if __USER_LABEL_PREFIX__ == _ |
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17 | |
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18 | but this fails for arm-elf targets because although |
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19 | __USER_LABEL__PREFIX__ is defined, it is not defined to |
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20 | a specific value (even 0) and so the above test fails |
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21 | with: |
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22 | |
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23 | operator '==' has no left operand |
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24 | |
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25 | Instead we have to test the CPP predefined __ELF__ and |
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26 | rely upon the *assumption* that ELF targets will not use |
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27 | an underscore prefix and that COFF targets will. */ |
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28 | |
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29 | #ifdef __ELF__ |
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30 | #define FOO "" |
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31 | #else |
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32 | #define FOO "_" |
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33 | #endif |
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34 | |
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35 | #define _MCOUNT_DECL(frompc, selfpc) \ |
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36 | void __attribute__ ((__no_instrument_function__)) \ |
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37 | mcount_internal (frompc, selfpc) |
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38 | |
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39 | /* mcount_internal expects two arguments |
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40 | r0 frompc (return address for function that call function that calls mcount) |
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41 | r1 selfpc (return address for function that called mcount) |
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42 | |
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43 | The frompc is extracted from the stack frames. If the code does not |
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44 | generate stack frames, then mcount cannot extract this |
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45 | information. Thus, the -fomit-frame-pointer optimization cannot be |
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46 | used if a call graph information is required. |
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47 | |
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48 | Due to optimizations mcount doesn't set up a new fp. mcount has the fp |
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49 | of the calling function. |
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50 | |
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51 | r0 frompc is from the current frame |
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52 | r1 selfpc can be obtained directly from lr. */ |
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53 | |
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54 | #ifdef __thumb__ |
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55 | #define MCOUNT \ |
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56 | void __attribute__ ((__naked__)) \ |
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57 | __attribute__ ((__no_instrument_function__)) \ |
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58 | mcount (void) \ |
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59 | { \ |
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60 | __asm__("push {r0, r1, r2, r3, lr};" \ |
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61 | "add r0, r7, #0;" \ |
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62 | "beq 1f;" \ |
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63 | "sub r0, r0, #4;" \ |
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64 | "ldr r0, [r0];" \ |
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65 | "1: mov r1, lr;" \ |
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66 | "bl " FOO "mcount_internal ;" \ |
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67 | "pop {r0, r1, r2, r3, pc};" \ |
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68 | ); \ |
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69 | } |
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70 | #else |
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71 | #define MCOUNT \ |
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72 | void __attribute__ ((__naked__)) \ |
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73 | __attribute__ ((__no_instrument_function__)) \ |
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74 | mcount (void) \ |
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75 | { \ |
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76 | __asm__("stmdb sp!, {r0, r1, r2, r3, lr};" \ |
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77 | "movs r0, fp;" \ |
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78 | "ldrne r0, [r0, #-4];" \ |
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79 | "mov r1, lr;" \ |
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80 | "bl " FOO "mcount_internal ;" \ |
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81 | "ldmia sp!, {r0, r1, r2, r3, pc};" \ |
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82 | ); \ |
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83 | } |
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84 | #endif |
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85 | |
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86 | #define FUNCTION_ALIGNMENT 2 |
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87 | |
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88 | #endif /* !__XSCALE_PROFILE_H__ */ |
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